Portable power hand saw guide



Feb. 11, 1958 G. MONDRICKW PORTABLE POWER HAND SAW GUIDE 7 5 Sheets-Sheet 1 Filed April 25, 1955 zasi l/owzk INVENTOR.

G. MONDRICK PORTABLE POWER HAND SAW GUIDE Feb. 11, 1958 3 Sheets-Sheet 2 Filed April 25, 1955 Feb. 11, 1958 G. MONDRICK PORTABLE POWER HAND SAW GUIDE 5 Sheets-Sheet 3 Q x,

Filed April 25, 1955 PORTABLE rowan HAND SAW onion Gus Mondrick, Rhome, Tex. Application April 25, 1955, Serial No. 503,442

1 Claim. (Cl. 143-6) This invention relates to woodcutting tools, and it has particular reference to attachments for power hand saws for cutting angles, as in the preparation of rafters, and the like, for wood frame structures, and its principal object resides in the provision of a light and simply constructed guide attachment capable of being readily applied to any conventional make of electrically operated hand saw of the circular type commonly used by carpenters for cutting lumber.

An object of the invention is that of providing an at tachment for power saws which will simplify the operations attendant upon cutting angles, particularly on socalled dimension lumber, such as 2 x 4s, 2 x 6s, and the like, for roof structures, the invention being adapted for adjustment to the desired angle without computing the same, so that the work can be accomplished by persons not possessed of the skill ordinarily required for the proper calculation of angular cuts for different types of roofs, and similar structures, so that a person of ordinary skill can operate the device.

A further object of the invention resides in the provision of a guide attachment which embodies means for adjustment to different angles with respect to the saw blade through a segment having calibrations thereon whereby the desired angles can be readily determined and fixed with a minimum of effort.

Broadly, the invention contemplates the provision of a saw attachment of the character described which is compact and light in structure and simple in design whereby the same can be readily and easily transported or stored.

While the foregoing objects are paramount, other and lesser objects will become manifest as the description proceeds taken in connection with the appended drawings wherein:

Figure l is a side elevational view of a typical power hand saw showing the invention attached thereto.

Figure 2 is a plan view of a conventional power hand saw showing the adjustable guide bar, the angular bar and the semi-circular frame for the angular bar.

Figure 3 is a plan View of the invention illustrating the guide bar having the T-groove longitudinally thereof, the semi-circular frame, and angular bar.

Figure 4 is an edge view of the invention from the side opposite the saw.

Figure 5 is an inverted plan view of the invention showing the angular bar attached to the frame, and showing the arms for securing the invention to a power saw, and

Figure 6 is a sectional elevational view taken on the I lines 6-6 of Fig. 2.

The invention is designed for attachment to any one of the conventional makes of portable electric hand saws having the circular type blade and comprises a frame Whose main portion consists of a guide bar 10 which is adapted to be detachably secured to the left or inner side of a power hand saw 11, as illustrated in Figure 2. The

atent 0 conventional hand saw of this type is provided with a base plate 12, through which the blade 13 operates, a shield 14 and a handle 15, as shown in Figures 1 and 2.

The guide bar 10 of the invention is of suitable length, extending forwardly and rearwardly of the saw 11 and is formed with a T-groove 16 longitudinally thereo-f providing a way or slide for plates 17 and 18 which are adapted to move along the T-groove 16 and have arms 19 and 20 attached thereto and extending laterally from the guide bar 10 to engage any type of keeper members 21 and 22 rigidly attached to the base plate 12 of the saw 11 and detachably secured by screws 23 and 24, or other device. The saw 11 is thus capable of free movement longitudinally of the guide bar 10 in either direction. A movable stop 25 is arranged in the T-groove 16 and is capable of being rigidly fixed at different locations by a thumb screw 26 to limit the movement of the saw 11 in its forward direction operation.

Rigidly fixed to or formed with the guide bar 10 is a semi-circular segment 27, extending oppositely from the saw 11, having a web 28 therein for strengthening the same, and having an arcuate slot 29 formed therein, as shown in Figures 1, 3 and 5. An angularly disposed bar 30 is arranged across the guide bar 10 and the semi-circular segment 27 and is pivoted at 31 to the guide bar 10 so that it can be moved to different angular positions with respect to the latter. A bolt 32 is arranged through the angular bar 30 and the arcuate slot 29 having a thumbnut 32 thereon for providing fixed adjustments of the angular bar 30 in its different angular positions.

It is desirable to provide spaced delineations along the arcuate slot 29 having numerical indicia at intervals therealong indicating a variety of angles at which the angular bar 30 can be fixed for performing predetermined angular cuts on the materials 33 to which the saw 11 is applied. The calibrated indicia 34 (Figure 3) may be spaced in any desired manner. It is desirable also that spaced divisions 35 be provided along the guide bar 10 by which to properly locate the stop 25. A handle 36 is provided on one end of the guide bar 10 for the operation of the device.

It is contemplated that certain changes and modifications in the structure and design of the invention may be resorted to from time to time by persons skilled in the art, without departing from the spirit and intent of the invention or the "scope of the appended claim.

What is claimed is:

In combination with a portable electric saw having a base, a guide frame having a guide bar formed with a T- groove longitudinally thereof and a pair of arms slidably arranged in the T-groove and extending laterally therefrom for detachably securing the saw base thereto, a semicircular segment formed with the guide bar and extending oppositely from the arms and having an arcuate slot therein, an adjustable angular bar pivoted to the guide bar at the center of the arcuate slot and securable to the segment in the slot in different fixed angular adjustments with respect to the guide bar, the slot having an arcuate curvature eccentric to that of the segment, and an adjustable stop in the T-groove for the saw.

References Cited in the file of this patent UNITED STATES PATENTS 

